AAS 196th Meeting, June 2000
Session 2. Searching for and Characterizing Extra Solar Planets
Display, Monday, June 5, 2000, 9:20am-6:30pm, Empire Hall South

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[2.07] A Comparison of Optical/NIR Spectroscopy of Ten Late-type Dwarfs with Synthetic Models

P.C. Dawson (Trent University), M.M. De Robertis (York University)

The spectra of 10 late-type dwarfs are compared with synthetic spectra. Effective temperatures and metallicities are estimated using two techniques, generally under the assumption that \log{g} = 5.0. The stars are also classified according to their CaH and TiO band-strength indices. Three of the 10 prove to be extreme subdwarfs, three are subdwarfs, and the remaining four are apparently members of the old disk population, two of them being close binaries.

Metallicities span the range -2.5\le {\rm [M/H]}\le 0.0, but the esdM stars seem to be rather more metal-rich than might have been expected; this result may arise from the fact that the metal-poor halo stars do not have the scaled solar abundance patterns assumed in the underlying model atmospheres.

This research has been supported financially by the Natural Sciences and Engineering Research Council of Canada.

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